X-ASR is the world’s first 4th generation MOSFET protected against reverse polarity. It saves space, time and money because additional regular fuse is no longer needed. Acting as an electronic guard, X-ASR improves your AEG’s safety and durability through conformal coating and self-test with 2 LEDs. Although designed for up to M120 springs, in full auto mode, X-ASR cooperates even with M150 spring. Moreover, in case of high torque motor and gears you can use stronger spring.
You can find more information at the manufacturers website .